Jaw locked? What to do right now — and what to avoid

Quick answer: a locked jaw is frightening but very rarely dangerous. Eat soft, rest the jaw, use warmth, do not force it, and see a specialist TMD physiotherapist rather than waiting in A&E. At The TMD Physio in Waterloo, London, you can self-refer for a locked jaw — tell us it is a lock and we will find you the earliest slot.

First, which kind of lock is it?

There are two very different problems that patients both call a "locked jaw". Knowing which you have tells you what to do first.

Closed lock — the jaw will not open fully

The small cushioning disc inside the temporomandibular joint (TMJ) has slipped forward and sits in the way of the hinge, so the jaw can rotate but cannot glide forward. Clinically this is an anterior disc displacement without reduction. It usually feels like:

• opening limited to about 20–30 mm (roughly two finger-widths)
• the jaw swinging towards the locked side as you open
• a click you have had for years suddenly going quiet
• an ache in front of the ear that is worse with chewing or yawning

Open lock — the jaw is stuck open or will not close

The jaw hinge has slid forward past the bony ridge in front of it and the muscles have clamped down to hold it there. Clinically this is a TMJ subluxation (partial) or dislocation (complete). It usually happens after a wide yawn, a long dental appointment, laughing or a big bite, and the teeth cannot be brought together.

If your jaw is stuck wide open right now and will not close at all, call us straight away on +44 7899 121 612. Krina will tell you exactly what to do and arrange the quickest route to getting it back in place.

Do this now

1. Eat soft food and cut it small. Avoid anything that needs a wide bite — apples, baguettes, burgers, corn on the cob.
2. Rest the jaw in its neutral position. Lips together, teeth slightly apart, tongue resting lightly on the roof of the mouth just behind the front teeth.
3. Use warmth. A warm (not hot) compress on the side of the face for 10–15 minutes, two or three times a day, eases the muscle guarding around the joint.
4. Support your chin when you yawn. When you feel a yawn coming, place a fist under your chin so the mouth cannot open wide.
5. Measure once a day. Each morning, note how many finger-widths you can comfortably fit between your front teeth. This gives your physiotherapist a baseline and shows whether things are easing or worsening.

Avoid these

• Do not repeatedly force or "test" the lock. Every forced attempt inflames the joint and tightens the muscles further, making the lock harder to release.
• Skip chewing gum, nail biting and long dental appointments until you have been assessed.
• Do not wait weeks for it to "sort itself out". Some closed locks ease over months as the tissues adapt, but many do not fully resolve, and the longer the joint stays restricted the harder it is to regain full opening. The sooner a closed lock is treated, the easier it is to restore movement.

Who should I see?

A locked jaw is a mechanical problem of the temporomandibular joint, so the right clinician is a specialist TMD physiotherapist. A&E and NHS 111 can check for a fracture or a dislocation after an injury, but they rarely provide the joint mobilisation, muscle release and rehabilitation that restore opening — and a hospital referral to a jaw clinic can take months. You do not need a GP or dental referral to see Krina Panchal at The TMD Physio.

How a locked jaw is treated

For a closed lock, treatment combines gentle joint distraction and mobilisation to free the hinge, intra-oral release of the masseter and pterygoid muscles that are guarding the joint, and a graded opening programme so the gains hold. The aim is either to recapture the displaced disc or — more commonly — to restore comfortable, full function with the disc in its new position. Many patients leave the first session opening further than they arrived.

For an open lock, once the jaw is back in place, treatment calms the spasm, restores controlled movement and builds the stability that stops it happening again.

Recent closed locks often improve within the first two or three sessions; longer-standing locks typically need a course of six to twelve. Imaging is rarely needed — the diagnosis is made from your history and a hands-on examination.

Booking

The Initial Assessment is 55 minutes (£295) at 121 Westminster Bridge Road, Waterloo, London SE1 7HR — two minutes from Lambeth North and Waterloo stations. Mention that your jaw is locked when you book and we will prioritise the earliest slot.

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